diff --git a/src/devices/machine/am79c90.cpp b/src/devices/machine/am79c90.cpp
index 38da531a2cd..ce2fb4837fe 100644
--- a/src/devices/machine/am79c90.cpp
+++ b/src/devices/machine/am79c90.cpp
@@ -59,7 +59,7 @@ DEFINE_DEVICE_TYPE(AM79C90, am79c90_device, "am79c90", "Am79C90 C-LANCE Ethernet
 
 am7990_device_base::am7990_device_base(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, u32 clock)
 	: device_t(mconfig, type, tag, owner, clock)
-	, device_network_interface(mconfig, *this, 10.0f)
+	, device_network_interface(mconfig, *this, 10)
 	, m_intr_out_cb(*this)
 	, m_dma_in_cb(*this)
 	, m_dma_out_cb(*this)
diff --git a/src/devices/machine/cs8900a.cpp b/src/devices/machine/cs8900a.cpp
index 6f6535150f7..52e0808bb01 100644
--- a/src/devices/machine/cs8900a.cpp
+++ b/src/devices/machine/cs8900a.cpp
@@ -377,7 +377,7 @@ void cs8900a_device::device_start()
 
 cs8900a_device::cs8900a_device(const machine_config& mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock)
 	: device_t(mconfig, type, tag, owner, clock)
-	, device_network_interface(mconfig, *this, 10.0f)
+	, device_network_interface(mconfig, *this, 10)
 	, cs8900_ia_mac{0, 0, 0, 0, 0, 0}
 	, cs8900_packetpage_ptr(0)
 	, cs8900_recv_control(0)            /* copy of CC_RXCTL (contains all bits below) */
diff --git a/src/devices/machine/dp8390.cpp b/src/devices/machine/dp8390.cpp
index 75217661215..49b98e94846 100644
--- a/src/devices/machine/dp8390.cpp
+++ b/src/devices/machine/dp8390.cpp
@@ -19,7 +19,7 @@ rtl8019a_device::rtl8019a_device(const machine_config &mconfig, const char *tag,
 {
 }
 
-dp8390_device::dp8390_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock, TYPE variant, float bandwidth)
+dp8390_device::dp8390_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock, TYPE variant, u32 bandwidth)
 	: device_t(mconfig, type, tag, owner, clock)
 	, device_network_interface(mconfig, *this, bandwidth)
 	, m_variant(variant)
diff --git a/src/devices/machine/dp8390.h b/src/devices/machine/dp8390.h
index 64bc6436733..1dfde1f01a5 100644
--- a/src/devices/machine/dp8390.h
+++ b/src/devices/machine/dp8390.h
@@ -30,7 +30,7 @@ protected:
 	};
 
 	// construction/destruction
-	dp8390_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock, TYPE varian, float bandwidth);
+	dp8390_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock, TYPE varian, u32 bandwidth);
 
 	// device-level overrides
 	virtual void device_start() override;
diff --git a/src/devices/machine/dp83932c.cpp b/src/devices/machine/dp83932c.cpp
index ef50d8ed4e0..cadef10e602 100644
--- a/src/devices/machine/dp83932c.cpp
+++ b/src/devices/machine/dp83932c.cpp
@@ -66,7 +66,7 @@ static u16 const regmask[] =
 
 dp83932c_device::dp83932c_device(machine_config const &mconfig, char const *tag, device_t *owner, u32 clock)
 	: device_t(mconfig, DP83932C, tag, owner, clock)
-	, device_network_interface(mconfig, *this, 10.0f)
+	, device_network_interface(mconfig, *this, 10)
 	, m_bus(*this, finder_base::DUMMY_TAG, 0)
 	, m_out_int(*this)
 	, m_int_state(false)
diff --git a/src/devices/machine/edlc.cpp b/src/devices/machine/edlc.cpp
index 87f42602828..480b0520c03 100644
--- a/src/devices/machine/edlc.cpp
+++ b/src/devices/machine/edlc.cpp
@@ -39,7 +39,7 @@ static const u8 ETH_BROADCAST[] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 
 seeq8003_device::seeq8003_device(machine_config const &mconfig, device_type type, char const *tag, device_t *owner, u32 clock)
 	: device_t(mconfig, type, tag, owner, clock)
-	, device_network_interface(mconfig, *this, 10.0f)
+	, device_network_interface(mconfig, *this, 10)
 	, m_out_int(*this)
 	, m_out_rxrdy(*this)
 	, m_out_txrdy(*this)
diff --git a/src/devices/machine/i82586.cpp b/src/devices/machine/i82586.cpp
index 510acc4e9d2..360d404836c 100644
--- a/src/devices/machine/i82586.cpp
+++ b/src/devices/machine/i82586.cpp
@@ -111,7 +111,7 @@ CFG_PARAMS[] =
 i82586_base_device::i82586_base_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock, endianness_t endian, u8 datawidth, u8 addrwidth)
 	: device_t(mconfig, type, tag, owner, clock)
 	, device_memory_interface(mconfig, *this)
-	, device_network_interface(mconfig, *this, 10.0f)
+	, device_network_interface(mconfig, *this, 10)
 	, m_space_config("shared", endian, datawidth, addrwidth)
 	, m_out_irq(*this)
 	, m_cx(false)
diff --git a/src/devices/machine/smc91c9x.cpp b/src/devices/machine/smc91c9x.cpp
index 8b0d22f8c71..3b661933e42 100644
--- a/src/devices/machine/smc91c9x.cpp
+++ b/src/devices/machine/smc91c9x.cpp
@@ -62,7 +62,7 @@ smc91c96_device::smc91c96_device(const machine_config &mconfig, const char *tag,
 
 smc91c9x_device::smc91c9x_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock, dev_type device_type)
 	: device_t(mconfig, type, tag, owner, clock)
-	, device_network_interface(mconfig, *this, 10.0f)
+	, device_network_interface(mconfig, *this, 10)
 	, m_device_type(device_type)
 	, m_num_ebuf(16)
 	, m_irq_handler(*this)
diff --git a/src/emu/dinetwork.cpp b/src/emu/dinetwork.cpp
index 69cc7e9235f..3ad9f4c925b 100644
--- a/src/emu/dinetwork.cpp
+++ b/src/emu/dinetwork.cpp
@@ -3,11 +3,13 @@
 #include "emu.h"
 #include "osdnet.h"
 
-device_network_interface::device_network_interface(const machine_config &mconfig, device_t &device, float bandwidth)
+device_network_interface::device_network_interface(const machine_config &mconfig, device_t &device, u32 bandwidth, u32 mtu)
 	: device_interface(device, "network")
 {
 	m_promisc = false;
-	m_bandwidth = bandwidth;
+	// Convert to Mibps to Bps
+	m_bandwidth = bandwidth << (20 - 3);
+	m_mtu = mtu;
 	set_mac("\0\0\0\0\0\0");
 	m_intf = -1;
 	m_loopback_control = false;
@@ -44,7 +46,7 @@ int device_network_interface::send(u8 *buf, int len, int fcs)
 		if (result)
 		{
 			// schedule receive complete callback
-			m_recv_timer->adjust(attotime::from_ticks(len, m_bandwidth * 1'000'000 / 8), result);
+			m_recv_timer->adjust(attotime::from_ticks(len, m_bandwidth), result);
 		}
 	}
 	else if (m_dev)
@@ -56,7 +58,7 @@ int device_network_interface::send(u8 *buf, int len, int fcs)
 	}
 
 	// schedule transmit complete callback
-	m_send_timer->adjust(attotime::from_ticks(len, m_bandwidth * 1'000'000 / 8), result);
+	m_send_timer->adjust(attotime::from_ticks(len, m_bandwidth), result);
 
 	return result;
 }
@@ -84,7 +86,7 @@ void device_network_interface::recv_cb(u8 *buf, int len)
 			m_dev->stop();
 
 		// schedule receive complete callback
-		m_recv_timer->adjust(attotime::from_ticks(len, m_bandwidth * 1'000'000 / 8), result);
+		m_recv_timer->adjust(attotime::from_ticks(len, m_bandwidth), result);
 	}
 }
 
@@ -113,7 +115,8 @@ void device_network_interface::set_interface(int id)
 {
 	if(m_dev)
 		m_dev->stop();
-	m_dev.reset(open_netdev(id, this, (int)(m_bandwidth*1000000/8.0f/1500)));
+	// Set device polling time to transfer time for one mtu
+	m_dev.reset(open_netdev(id, this, (int)(m_bandwidth / m_mtu)));
 	if(!m_dev) {
 		device().logerror("Network interface %d not found\n", id);
 		id = -1;
diff --git a/src/emu/dinetwork.h b/src/emu/dinetwork.h
index 99909e93905..c2629f665fc 100644
--- a/src/emu/dinetwork.h
+++ b/src/emu/dinetwork.h
@@ -8,7 +8,7 @@ class osd_netdev;
 class device_network_interface : public device_interface
 {
 public:
-	device_network_interface(const machine_config &mconfig, device_t &device, float bandwidth);
+	device_network_interface(const machine_config &mconfig, device_t &device, u32 bandwidth, u32 mtu = 1500);
 	virtual ~device_network_interface();
 
 	void interface_pre_start() override;
@@ -39,7 +39,10 @@ protected:
 
 	bool m_promisc;
 	char m_mac[6];
-	float m_bandwidth;
+	// bandwidth in bytes per second
+	u32 m_bandwidth;
+	// maximum transmission unit, used for device polling time
+	u32 m_mtu;
 	std::unique_ptr<osd_netdev> m_dev;
 	int m_intf;
 	bool m_loopback_control;